function previewImage(file)
	{
	  var MAXWIDTH  = 200;
	  var MAXHEIGHT = 200;
	  var div = document.getElementById('preview');
	  if (file.files && file.files[0])
	  {
	    div.innerHTML = '<img id=imghead>';
	    var img = document.getElementById('imghead');
	    img.onload = function(){
	      var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
	      img.width = rect.width;
	      img.height = rect.height;
	      img.style.marginLeft = rect.left+'px';
	      img.style.marginTop = rect.top+'px';
	    }
	    var reader = new FileReader();
	    reader.onload = function(evt){img.src = evt.target.result;}
	    reader.readAsDataURL(file.files[0]);
	  }else{
	    var sFilter='filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
	    file.select();
	    var src = document.selection.createRange().text;
	    div.innerHTML = '<img id=imghead>';
	    var img = document.getElementById('imghead');
	    img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
	    var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
	    status =('rect:'+rect.top+','+rect.left+','+rect.width+','+rect.height);
	    div.innerHTML = "<div id=divhead style='width:"+rect.width+"px;height:"+rect.height+"px;margin-top:"+rect.top+"px;margin-left:"+rect.left+"px;"+sFilter+src+"\"'></div>";
	  }
	}
	function clacImgZoomParam( maxWidth, maxHeight, width, height ){
	    var param = {top:0, left:0, width:width, height:height};
	    if( width>maxWidth || height>maxHeight )
	    {
	        rateWidth = width / maxWidth;
	        rateHeight = height / maxHeight;
	        if( rateWidth > rateHeight )
	        {
	            param.width =  maxWidth;
	            param.height = Math.round(height / rateWidth);

	        }else{
	            param.width = Math.round(width / rateHeight);
	            param.height = maxHeight;
	        }
	    }
	    param.left = Math.round((maxWidth - param.width) / 2);
	    param.top = Math.round((maxHeight - param.height) / 2);
	    return param;
	}
	
	